From 0b31543098a9827aeb723304bd902efe5e995f13 Mon Sep 17 00:00:00 2001
From: feiy <feiy@nvidia.com>
Date: Sat, 13 Aug 2022 10:08:17 +0800
Subject: [PATCH] Adding serialization code for sparse accessors.

---
 tiny_gltf.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/tiny_gltf.h b/tiny_gltf.h
index 234e831..ce7248e 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -6693,6 +6693,27 @@ static void SerializeGltfAccessor(Accessor &accessor, json &o) {
   if (accessor.extras.Type() != NULL_TYPE) {
     SerializeValue("extras", accessor.extras, o);
   }
+
+  // sparse
+  if (accessor.sparse.isSparse)
+  {
+      json sparse;
+      SerializeNumberProperty<int>("count", accessor.sparse.count, sparse);
+      {
+          json indices;
+          SerializeNumberProperty<int>("bufferView", accessor.sparse.indices.bufferView, indices);
+          SerializeNumberProperty<int>("byteOffset", accessor.sparse.indices.byteOffset, indices);
+          SerializeNumberProperty<int>("componentType", accessor.sparse.indices.componentType, indices);
+          JsonAddMember(sparse, "indices", std::move(indices));
+      }
+      {
+          json values;
+          SerializeNumberProperty<int>("bufferView", accessor.sparse.values.bufferView, values);
+          SerializeNumberProperty<int>("byteOffset", accessor.sparse.values.bufferView, values);
+          JsonAddMember(sparse, "values", std::move(values));
+      }
+      JsonAddMember(o, "sparse", std::move(sparse));
+  }
 }
 
 static void SerializeGltfAnimationChannel(AnimationChannel &channel, json &o) {